85278721 has 8 divisors (see below), whose sum is σ = 93190464. Its totient is φ = 77393520.

The previous prime is 85278709. The next prime is 85278731. The reversal of 85278721 is 12787258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85278721 - 2²¹ = 83181569 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85278731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420 + ... + 13066.

It is an arithmetic number, because the mean of its divisors is an integer number (11648808).

It is a Proth number, since it is equal to 5205 ⋅ 2¹⁴ + 1 and 5205 < 2¹⁴.

Almost surely, 2^85278721 is an apocalyptic number.

It is an amenable number.

85278721 is a deficient number, since it is larger than the sum of its proper divisors (7911743).

85278721 is a wasteful number, since it uses less digits than its factorization.

85278721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13271.

The product of its digits is 62720, while the sum is 40.

The square root of 85278721 is about 9234.6478546829. The cubic root of 85278721 is about 440.1630267099.

The spelling of 85278721 in words is "eighty-five million, two hundred seventy-eight thousand, seven hundred twenty-one".